Just got 300 pieces of lapua blue box 6br brass, all the same lot. I plan on running them through my same prep process as before: trim to uniform length, run through expander mandrel, neck turn(tight neck chamber), inside chamfer and inspect flash holes. However Id like to sort these in to lots of 75 for matches(F-class), so I don't always have 20-25 cases with one less firing on them, I usually being 100 rounds with me to a 60 shot match and always have about 25-30 left over. what would you say is a good weight variance to start with? I've heard groups of .5 grains and anything within 1.0 grain of each other.